package appbase.kit.qr;

import java.awt.BasicStroke;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Shape;
import java.awt.geom.RoundRectangle2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.util.Hashtable;

import javax.imageio.ImageIO;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.BinaryBitmap;
import com.google.zxing.DecodeHintType;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatReader;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.Result;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

import appbase.utils.StringUtil;

/**
 * 二维码工具类
 */
public class QRUtil {

	private static final String CHARSET = "utf-8";
	private static final String FORMAT_NAME = "JPG";
	// 二维码尺寸
	private static final int QRCODE_SIZE = 300;

	public static void createQrImage(String content, int size, String imagePath) 
	{
		Hashtable<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>();
		hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
		hints.put(EncodeHintType.CHARACTER_SET, CHARSET);
		hints.put(EncodeHintType.MARGIN, 1);
		
		try {
			BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, size, size, hints);
			int width = bitMatrix.getWidth();
			int height = bitMatrix.getHeight();
			BufferedImage image = new BufferedImage(width, height,
					BufferedImage.TYPE_INT_RGB);
			for (int x = 0; x < width; x++) 
			{
				for (int y = 0; y < height; y++) 
				{
					image.setRGB(x, y, bitMatrix.get(x, y) ? 0xFF000000
							: 0xFFFFFFFF);
				}
			}
			
			ImageIO.write(image, FORMAT_NAME, new File(imagePath));
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	public static String createQrImageTo(String content, int size, String folderPath) 
	{
		File folder = new File(folderPath);
		if (!folder.exists()) 
		{
			folder.mkdirs();
		}
		
		String imageName = StringUtil.uniqueStrWithDateTime() + ".jpg";
		String imagePath = folderPath.endsWith("/") ? folderPath + imageName : folderPath + "/" + imageName;
		
		createQrImage(content, size, imagePath);
		return imagePath;
	}

	/**
	 * 插入LOGO
	 * @param source 二维码图片
	 * @param imgPath LOGO图片地址
	 * @param needCompress 是否压缩
	 * @throws Exception
	 */
	public static void insertImage(BufferedImage source, String imgPath, boolean needCompress, int logoWidth, int logoHeight) throws Exception 
	{
		File file = new File(imgPath);
		if (!file.exists()) 
		{
			System.err.println(""+imgPath+"   该文件不存在！");
			return;
		}
		Image src = ImageIO.read(new File(imgPath));
		int width = src.getWidth(null);
		int height = src.getHeight(null);
		if (needCompress) { // 压缩LOGO
			if (width > logoWidth) {
				width = logoWidth;
			}
			if (height > logoHeight) {
				height = logoHeight;
			}
			Image image = src.getScaledInstance(width, height,
					Image.SCALE_SMOOTH);
			BufferedImage tag = new BufferedImage(width, height,
					BufferedImage.TYPE_INT_RGB);
			Graphics g = tag.getGraphics();
			g.drawImage(image, 0, 0, null); // 绘制缩小后的图
			g.dispose();
			src = image;
		}
		// 插入LOGO
		Graphics2D graph = source.createGraphics();
		int x = (QRCODE_SIZE - width) / 2;
		int y = (QRCODE_SIZE - height) / 2;
		graph.drawImage(src, x, y, width, height, null);
		Shape shape = new RoundRectangle2D.Float(x, y, width, width, 6, 6);
		graph.setStroke(new BasicStroke(3f));
		graph.draw(shape);
		graph.dispose();
	}

	/**
	 * 解析二维码
	 * @param file 二维码图片
	 * @return
	 * @throws Exception
	 */
	public static String decode(File file) throws Exception {
		BufferedImage image;
		image = ImageIO.read(file);
		if (image == null) {
			return null;
		}
		BufferedImageLuminanceSource source = new BufferedImageLuminanceSource(
				image);
		BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
		Result result;
		Hashtable<DecodeHintType, Object> hints = new Hashtable<DecodeHintType, Object>();
		hints.put(DecodeHintType.CHARACTER_SET, CHARSET);
		result = new MultiFormatReader().decode(bitmap, hints);
		String resultStr = result.getText();
		return resultStr;
	}


	public static void main(String[] args) throws Exception {
		
		String folderPath = "/Users/leigl/Desktop/qr-images";
		
		/*String content = "http://mailema.com";
		int size = 300;
		createQrImage(content, size, folderPath);*/
		
		File image = new File(folderPath + "/20160509091614_1462756574312_6901_2396_8016.jpg");
		String text = decode(image);
		System.out.println(text);
		
	}
	
}
